NPS / Neal Herbert
Male bison "bellow" in order to announce their presence and establish dominance in a herd. During the mating season or "rut," bellowing becomes more prevalent, creating a signature sound of midsummer in Yellowstone.
It's late summer, and male bison along the Mary Mountain Trail bellow to display their dominance over other bulls.
A longer version of the above clip. In this one, you can hear bison browsing on grasses as well as bellowing.
Last updated: September 8, 2017
P.O. Box 168
Yellowstone National Park, WY